Try and unplug it for a while so that it can reset itself and it should work. If that does not work, try pressing and holding the power button in. And if that does not work, You may have a circuit board short that only lets it come on at certain times so that it will not catch fire. You might need to get it checked up in a shop to confirm the suspicion and to get it fixed.

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it is easy to fix. get your self a case of beer and a fifth of jack and then look for cp 150 cp120 and cp114 as i did after pulling the star shaped screws out of the back of the t.v. and then finally throw the damn thing in the back yard and shoot it

My RCA 52 inch was doing the same thing. TV guy had me use a regular hair blower blowing very hot on the power supply board ( bottom left in back). After a few minutes the tv would come on. He replaced 2 capacitors, charged me $100.00, plus the $95.00 service call, and is working fine now. This was a month ago. So far so good. He only took the board to the shop, not the entire tv. Hope this helps.